ActiveMQ example source code file (IndexBenchmark.java)

This example ActiveMQ source code file (IndexBenchmark.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

atomicboolean, atomiclong, consumer, exception, index, index, index_count, index_count, io, long, long, producer, producer, string, threading, threads, transaction, util

The ActiveMQ IndexBenchmark.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.kahadb.index;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;

import junit.framework.TestCase;
import org.apache.kahadb.page.PageFile;
import org.apache.kahadb.page.Transaction;
import org.apache.kahadb.util.IOHelper;

/**
 * @author chirino
 */
public abstract class IndexBenchmark extends TestCase {

    // Slower machines might need to make this bigger.
    private static final long SAMPLE_DURATION = Integer.parseInt(System.getProperty("SAMPLES_DURATION", "" + 1000 * 5));
    // How many times do we sample?
    private static final long SAMPLES = Integer.parseInt(System.getProperty("SAMPLES", "" + 60 * 1000 / SAMPLE_DURATION));
    // How many indexes will we be benchmarking concurrently?
    private static final int INDEX_COUNT = Integer.parseInt(System.getProperty("INDEX_COUNT", "" + 1));
    // Indexes tend to perform worse when they get big.. so how many items
    // should we put into the index before we start sampling.
    private static final int INDEX_PRE_LOAD_COUNT = Integer.parseInt(System.getProperty("INDEX_PRE_LOAD_COUNT", "" + 10000 / INDEX_COUNT));

    protected File ROOT_DIR;
    protected final HashMap<String, Index indexes = new HashMap>();
    protected PageFile pf;

    public void setUp() throws Exception {
        ROOT_DIR = new File(IOHelper.getDefaultDataDirectory());
        IOHelper.mkdirs(ROOT_DIR);
        IOHelper.deleteChildren(ROOT_DIR);
        
        pf = new PageFile(ROOT_DIR, getClass().getName());
        pf.load();
    }

    protected void tearDown() throws Exception {
        Transaction tx = pf.tx();
        for (Index i : indexes.values()) {
            try {
                i.unload(tx);
            } catch (Throwable ignore) {
            }
        }
        tx.commit();
    }

    abstract protected Index<String, Long> createIndex() throws Exception;

    synchronized private Index<String, Long> openIndex(String name) throws Exception {
        Transaction tx = pf.tx();
        Index<String, Long> index = indexes.get(name);
        if (index == null) {
            index = createIndex();
            index.load(tx);
            indexes.put(name, index);
        }
        tx.commit();
        return index;
    }

    class Producer extends Thread {
        private final String name;
        AtomicBoolean shutdown = new AtomicBoolean();

        public Producer(String name) {
            super("Producer: " + name);
            this.name = name;
        }

        public void shutdown() {
            shutdown.set(true);
        }

        @Override
        public void run() {
            try {

                Transaction tx = pf.tx();
                
                Index<String,Long> index = openIndex(name);
                long counter = 0;
                while (!shutdown.get()) {
                    long c = counter;

                    String key = key(c);
                    index.put(tx, key, c);
                    tx.commit();
                    Thread.yield(); // This avoids consumer starvation..
                    
                    onProduced(counter++);
                }

            } catch (Throwable e) {
                e.printStackTrace();
            }
        }

        public void onProduced(long counter) {
        }
    }
    
    protected String key(long c) {
        return "a-long-message-id-like-key-" + c;
    }


    class Consumer extends Thread {
        private final String name;
        AtomicBoolean shutdown = new AtomicBoolean();

        public Consumer(String name) {
            super("Consumer: " + name);
            this.name = name;
        }

        public void shutdown() {
            shutdown.set(true);
        }

        @Override
        public void run() {
            try {
                Transaction tx = pf.tx();

                Index<String,Long> index = openIndex(name);
                long counter = 0;
                while (!shutdown.get()) {
                    long c = counter;
                    String key = key(c);
                    
                    Long record = index.get(tx, key);
                    if (record != null) {
                        if( index.remove(tx, key) == null ) {
                            System.out.print("Remove failed...");
                        }
                        tx.commit();
                        onConsumed(counter++);
                    }
                }
            } catch (Throwable e) {
                e.printStackTrace();
            }
        }

        public void onConsumed(long counter) {
        }
    }

    protected void dumpIndex(Index<String, Long> index) throws IOException {
    }

    public void testLoad() throws Exception {

        final Producer producers[] = new Producer[INDEX_COUNT];
        final Consumer consumers[] = new Consumer[INDEX_COUNT];
        final CountDownLatch preloadCountDown = new CountDownLatch(INDEX_COUNT);
        final AtomicLong producedRecords = new AtomicLong();
        final AtomicLong consumedRecords = new AtomicLong();

        System.out.println("Starting: " + INDEX_COUNT + " producers");
        for (int i = 0; i < INDEX_COUNT; i++) {
            producers[i] = new Producer("test-" + i) {
                private boolean prelaodDone;

                public void onProduced(long counter) {
                    if (!prelaodDone && counter >= INDEX_PRE_LOAD_COUNT) {
                        prelaodDone = true;
                        preloadCountDown.countDown();
                    }
                    producedRecords.incrementAndGet();
                }
            };
            producers[i].start();
        }

        long start = System.currentTimeMillis();
        System.out.println("Waiting for each producer create " + INDEX_PRE_LOAD_COUNT + " records before starting the consumers.");
        preloadCountDown.await();
        long end = System.currentTimeMillis();
        System.out.println("Preloaded " + INDEX_PRE_LOAD_COUNT * INDEX_COUNT + " records at " + (INDEX_PRE_LOAD_COUNT * INDEX_COUNT * 1000f / (end - start)) + " records/sec");

        System.out.println("Starting: " + INDEX_COUNT + " consumers");
        for (int i = 0; i < INDEX_COUNT; i++) {
            consumers[i] = new Consumer("test-" + i) {
                public void onConsumed(long counter) {
                    consumedRecords.incrementAndGet();
                }
            };
            consumers[i].start();
        }

        long sample_start = System.currentTimeMillis();
        System.out.println("Taking " + SAMPLES + " performance samples every " + SAMPLE_DURATION + " ms");
        System.out.println("time (s), produced, produce rate (r/s), consumed, consume rate (r/s), used memory (k)");
        producedRecords.set(0);
        consumedRecords.set(0);
        for (int i = 0; i < SAMPLES; i++) {
            start = System.currentTimeMillis();
            Thread.sleep(SAMPLE_DURATION);
            end = System.currentTimeMillis();
            long p = producedRecords.getAndSet(0);
            long c = consumedRecords.getAndSet(0);

            long usedMemory = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

            System.out.println(((end-sample_start)/1000f)+", "+p+", "+(p * 1000f / (end - start)) + ", "+ c+", " + (c * 1000f / (end - start))+", "+(usedMemory/(1024)) );
        }
        System.out.println("Samples done... Shutting down the producers and consumers...");
        for (int i = 0; i < INDEX_COUNT; i++) {
            producers[i].shutdown();
            consumers[i].shutdown();
        }
        for (int i = 0; i < INDEX_COUNT; i++) {
            producers[i].join(1000 * 5);
            consumers[i].join(1000 * 5);
        }
        System.out.println("Shutdown.");
    }

}